Trestle-scaffold.



G. BONENBERGER.

TRESTLE SCAFFOLD.

APPLICATION- msn APR. 15, 1913.

l l m I Patented May 11, 1915.

2 SHEETS-SHEET I- /4 Snow W01,

q qmiflaoow I & an. @g r 3 G.v BONENBERGER.

TRESTLE SCAFFOLD.

APPLICATIQN map APR. 15, 1913.

l ma asg, v I Patented May 11, 1 915. V

2 SHEETSSHEET 2- UNITED STATES PATENT OFFICE.

GEORGE BONENBERGER, OF EVANSVILLE, INDIANA, ASSIGNOR T0 STEELSCAFFOLDING- 9 COMPANY, OF EVANSVILLE, INDIANA, A. CORPORATION OFINDIANA.

TRESTLE-SCAFFOLD.

Specification of Letters Patent.

Patented May 11, 1915.

Application filed April 15, 1913. Serial No. 761,214.

To all whom it may concern Be it known that I, GEORGE BONENBERGER, acitizen of the United States, residing at Evansville, county ofVanderburg, and State of Indiana, have invented certain new and usefulImprovements .in Trestle-Scaffolds, of which the following is aspecification. i

This invention relates to trestle scaffolds.

My object is to provide a trestle scaffold of improved construction,adapted for use by brick layers, carpenters, mechanics and others, whichwill be light, simple, strong and inexpensive and may be taken down orput up with ease.

Another object is to provide a scaffold of the class set forth whichwill be of unitary construction, whereby successive scaflold units maybe added, from time to time as desired, to increase the height of thescaffold, each unit being complete.

The invention has for another object the provision of a unitaryscafi'old wherein the units are adapted for connection together in animproved manner.

The invention consists, first, in a trestle scaffold which hashorizontal members combined with uprights in an improved mantained andadapted for addition to each.

other; fifth, in the provision of aunitary scaffold, the units of whichare complete and have improved means whereby they may be added to eachother; sixth, in the general improved scaffold hereinafter set forth.

In the accompanying drawings Figure 1 is a perspective of a completesection or unit of the scaifold; Fig. 2, a detail yiew of one of theuprights; Fig. 3, a similar view of one of the braces; Fig. 4, a detailof one of the clamping hooks; and Fig. 5, a perspective of two of thescaffold units connected together.

Referring first to Fig. 1, the horizontal members 1 are of wood, piecesof plank being used. The uprights 2 are of angle iron and are providedwith rows of holes 3. and 4 for the accommodation ofthe shanks of theclamping screws 5 and the brace clamps- 6, respectively.

The hook clamps 5 have points 7 which are adapted to enter the woodenmembers. 1,

'therebyinsuring against any slippage of the vided thereon handles 10 bywhich the hook clamps can be tightened. The holes 3 and 4 also providefor the accommodation of straps 11 of the handled brace clamps 6 whichare in all respects similar to the' clamps 5, and by which woodencrossed braces 12, which connect the end parts of the scaffold, aresecure to the uprights. The points of the clamps engage the braces 12and these clamps provide for engagement of the braces 12 at difl'erentpoints thereof, permitting the end parts or uprights of the scaffold tobe adjusted toward or away from each other.

Referring to Fig. 3, angle iron braces 13 are adapted to be interposedbetween the members 1 and they have at their opposite ends hook clamps14 which are in all respects similar to the hook clamps 5 and areconnected to the braces 13 in the same manner. The braces 13 are longerthan the uprights 2 and are arranged diagonally there- 'of, the hookclamps 14 being engaged with the members 1, additional support beingthus afforded to the upper members 1 and rigidity of the end parts ofthe scaffold insured.

The scafi'old is complete, as shown in Fig. 1, save that planks or aplatform will be laid on the upper members 1 for the-brick layer,carpenter or' mechanic to stand on.

The scaffold can be readily knocked down or taken apart by releasing thedifferent clamps and all of the parts being straight, it can be packedinto very compact arrangement. Adjustment being provided, the end partsof the scaffold may be moved toward or away from each other and theheight of be extended to any desired height, as shown in Fig. 5, thelower un'it being shown at A and the upper one at. B. Each unit is ofthe construction hereinbefore set forth except that there is but oneupper horizontal member 1 provided between the sections.

The respective braces 13 are arranged so that they form-a truss for theuprights of the respective sections A and B. The-planks or platform willbe supported by the uppermost member 1. As occasion arises for ascaffold of greater height, additional complete sections, such as shownin Fig. 1, will be added.

The provision of clamps on the uprights and inclined braces combinedwith the horizontal members with which said clamps are engaged, permitsthe lower scaffold or end frames to be built any width desired to af- 5ford the proper base for the ultimate height of the scaffold, while theupper or imposed frames may be drawn in to such narrower widths orpushed out to such wider widths as the workmen may desire to meet theirrequirements.

Having thus described my invention, what I claim as new and desire tosecure by Letters Patent, is:

1. A multiple unit scaffold composed of superposed end frames ortrestles, each comprising horizontal members, and uprights having clampsnear their ends, the intermediate horizontal members constituting acommon connecting means with which the clamps of the uprights of upperand lower end frames are engaged, said clamps affording means wherebythe uprights may be set at any desired points lengthwise of the commonhorizontal connecting members.

2. A multiple unit scaffold composed of superposed end frames ortrestles, each comprising horizontal members, and uprightshaving clampsnear their ends, the intermediate horizontal members with which theclamps of the uprights of upper and lower end frames are engagedconstituting a mmon and the sole connecting means bet en the uprights ofthe end frames, said clamps affording means whereby the uprights may beset at any desired points lengthwise of the common horizontal connectingmembers.

3. A multiple unit scaffold composed of superposed end frames ortrestles, each comprising horizontal members, uprights having clampsnear their ends, the intermediate horizontal members with which theclamps of the uprights of upper and lower end frames are engagedconstituting a common and the soleconnecting means between the uprightsof the end frames, said clamps affording means whereby the uprights maybe set at any desired points lengthwise of the common horizontalconnecting members, and inclined braces having clamps engaged with thehorizontal members and adapted to be set at any desired points of thelength of said horizontal members. I

4. A multiple unit scaffold composed of end frames or trestles eachcomprising uprights having clamps near their ends, and horizontalmembers of a vertical dimension greater than the distance of said clampsfrom the ends of said uprights so that a por tion of the horizontalmember is vertically beyond the end of certain of the uprights andengageable by the clamps at the ends of a superposed series of uprightseither in line with, or offset from, the others, and inclined braceshaving clamps near their upper and lower ends detachably connecting themto the horizontal members of the end frames similarly to the connectionof the uprights above defined.

In testimony whereof, I hereunto affix my signature in presence of twowitnesses.-

GEORGE BONENBERGER. ,Witnesses:

J. R. GOODWIN,

F.- C. GORE.

